Electric pruning device



Dec. 30, 1930. L.. o. B. LINDsTRoM ET AL ELECTRIC PRUNING DEVICE FiledAug. 12, 1929'l Patented Dec. 30, 1930 UNITED STATES PATENT OFFICE:

LINN OLAF B. LINDSTROM AND DAVID G. SALA, OF SAN FRANCISCO, CALIFORNIAELECTRIC PRUN IN G DEVICE Application led August 12, 1929. Serial No.385,371.

This invention relates to an electrically driven pruning and trimmingdevice Vin which an electric solenoid operates acutter; and the objectof the invention is to make use of electric power in pruning andtrimming trees, shrubs, vines, hedges and other forms of vegetation. v

One form of the invention is illustrated in the accompanying drawing inwhich Figure lis a side view of the complete device showing the cutterface.` Figure 2 is a front view of the entire device with exception oflower pipe connection which has been cut oli to allow drawing space forFigure 3; Figure 3 is a detail of the moving cutter guide looking i upfrom the bottom on the section A-A.`

The solenoid 1, with its holdinglanges 2-2 is'rsecured to the supportingframe 3. The lower cutter 4 may be secured to the 2o frame 3, where thelatter makes a right angle turn to meet the plane of the cutter, in aHush lap joint, with the machine screws 5--5. The lower end of the frame3 is flared vout to a threaded pipe connection 6 to which may bethreaded a short or long handle for operation. The electrical conductorcable 7 may lead down through this pipe section and terminate in a plugconnection 8, for connecting to an electrical cord leading to a switch.

The moving cutter 9 may be secured to the operating stem 10 by means ofthe lmachine screws 1111 in a flush lap joint. The spiral spring 12around the stem10 returns the top cutter to the normally open position,by act` ing between the top solenoid flange 2, and the collar 13 on thestem 10.

The solenoid plunger or armature 14 may said frame, a detachable cutterblade secured to said frame, a vertically reciprocable operating stemcoupled to the solenoid plunger and passing through a guide on the bladesecured to the frame, a detachable cutter blade secured tosaid operatingstem, and a spiral spring surrounding said operating stem between thetop'of the solenoid and the stationary blade secured to said'frame, tohold the blades in an open position. 60

LINNv OLAF B. LINDSTROM. DAVID G. SALA.

be pivoted to the stem 10 by the pin 15. Thus,

when the solenoid is energized, the plungery v 40 14 pulls down the stem10 with the top cutter v 9 against the spring 12, to the lower cutter 4.The stem 10 slides in the guide 16 which may be secured to the lowercutter 4 bymeans of Y i the screws 17-17. i

We claim:`

In an electric pruning device, the combination of an electric solenoidand pruning cutters comprising a supporting frame flared out to a hollowthreaded pipe connection to admit 5c the electrical conductor, asolenoid secured toA 'i Y

